Fig. 2

Liquid inclusion residues. Photomicrograph (a), AFM image (b) and AFM height profile (c) of inclusion residue shown in Supplementary Fig. S1a. Red arrows in (a) indicate enclosed sedimentary layers of graphitic material. Photomicrograph (d), AFM image (e) and AFM heigh profile (f) of inclusion residue shown in Supplementary Fig. S1b. White outline in (a) and (d) indicates area of AFM images. Points in (b) and (e) labelled SX.X indicate position of AFM-IR spectrum acquisition, and red squares indicate position of AFM-IR maps (Supplementary Fig. S4). R1 in (b) refers to point of acquisition of Raman spectrum (Supplementary Fig. S3). Green and blue lines indicate positions of height profiles.